Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Abstract]
Income tax expense (benefit)	$ 457	$ (17,716)	[1]	$ 3,144
Segment Reporting Information [Line Items]
Interest income	370,172	282,218	[1]	175,505
Interest expense	(262,451)	(141,777)	[1]	(44,030)
Noninterest Income	169,199	(80,447)	[1]	19,562
Operating Expenses	187,710	84,965	[1]	65,441
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	89,210	(24,971)	[1]	85,596
Earnings (losses) from investments in unconsolidated entities	(855)	(63,614)	[1]	58,104
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	87,898	(70,869)	[1]	140,556
Net income (loss) attributable to non-controlling interests	3,814	(822)	[1]	7,093
Dividends on preferred stock	23,182	15,292	[1]	8,117
Net income (loss) attributable to common stockholders	60,902	(85,339)	[1]	125,346
Depreciation	1,095	330
Total Assets	15,315,930	14,085,886
Liabilities	13,780,318	12,865,000
Total Equity	1,535,612	1,220,886		1,323,556	$ 921,572
Longbridge Segment
Segment Reporting [Abstract]
Income tax expense (benefit)	0	0
Segment Reporting Information [Line Items]
Interest income	18,913	2,859
Interest expense	(25,822)	(4,628)
Noninterest Income	118,512	39,935
Operating Expenses	101,908	(23,674)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	9,695	14,492
Earnings (losses) from investments in unconsolidated entities	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	9,695	14,492
Net income (loss) attributable to non-controlling interests	(41)	32
Dividends on preferred stock	0	0
Net income (loss) attributable to common stockholders	9,736	14,460
Depreciation	1,095	330
Total Assets	9,092,840	8,227,509
Liabilities	8,872,153	8,092,313
Total Equity	220,687	135,196
Investment Portfolio Segment
Segment Reporting [Abstract]
Income tax expense (benefit)	0	0		0
Segment Reporting Information [Line Items]
Interest income	344,575	277,141		175,419
Interest expense	(223,814)	(124,308)		(38,990)
Noninterest Income	12,457	(118,797)		21,393
Operating Expenses	16,187	(29,532)		(21,638)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	117,031	4,504		136,184
Earnings (losses) from investments in unconsolidated entities	(855)	(63,614)		58,104
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	116,176	(59,110)		194,288
Net income (loss) attributable to non-controlling interests	3,125	212		5,294
Dividends on preferred stock	0	0		0
Net income (loss) attributable to common stockholders	113,051	(59,322)		188,994
Depreciation	0	0
Total Assets	5,978,988	5,635,657
Liabilities	4,555,212	4,499,669
Total Equity	1,423,776	1,135,988
Corporate and Other
Segment Reporting [Abstract]
Income tax expense (benefit)	457	(17,716)		3,144
Segment Reporting Information [Line Items]
Interest income	6,684	2,218		86
Interest expense	(12,815)	(12,841)		(5,040)
Noninterest Income	38,230	(1,585)		(1,831)
Operating Expenses	69,615	(31,759)		(43,803)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(37,516)	(43,967)		(50,588)
Earnings (losses) from investments in unconsolidated entities	0	0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(37,973)	(26,251)		(53,732)
Net income (loss) attributable to non-controlling interests	730	(1,066)		1,799
Dividends on preferred stock	23,182	15,292		8,117
Net income (loss) attributable to common stockholders	(61,885)	(40,477)		$ (63,648)
Depreciation	0	0
Total Assets	244,102	222,720
Liabilities	352,953	273,018
Total Equity	$ (108,851)	$ (50,298)

[1] Conformed to current period presentation.